compare_complex_doubles.c

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********************************************************************************
*   Contents: auxiliary test routine for C interface to LAPACK
*   Author: Intel Corporation
*   Created in December, 2009
*
*   Purpose
*
*   This routine tests two complex numbers for identity with a tolerance.
*******************************************************************************/

#include "test_utils.h"

int compare_complex_doubles( lapack_complex_double a,
                             lapack_complex_double b ) {
    double a_re = *((double*)&a);
    double a_im = *(((double*)&a)+1);
    double b_re = *((double*)&b);
    double b_im = *(((double*)&b)+1);
    double diff_re = ( a_re > b_re ) ? ( a_re - b_re ) : ( b_re - a_re );
    double diff_im = ( a_im > b_im ) ? ( a_im - b_im ) : ( b_im - a_im );
    return ( diff_re < DP_TOLERANCE &&
             diff_im < DP_TOLERANCE ) ? 0 : 1;
}